CN104325065B - A kind of precoated sand and preparation method thereof - Google Patents

A kind of precoated sand and preparation method thereof Download PDF

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Publication number
CN104325065B
CN104325065B CN201410522947.9A CN201410522947A CN104325065B CN 104325065 B CN104325065 B CN 104325065B CN 201410522947 A CN201410522947 A CN 201410522947A CN 104325065 B CN104325065 B CN 104325065B
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sand
parts
additive
mixing
binding agent
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CN104325065A (en
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浦巧生
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WUJIANG CASTING HYDRAULIC PARTS FOUNDRY CO Ltd
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WUJIANG CASTING HYDRAULIC PARTS FOUNDRY CO Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/20Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
    • B22C1/22Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
    • B22C1/2233Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B22C1/2273Polyurethanes; Polyisocyanates

Abstract

The invention discloses a kind of precoated sand and preparation method thereof.Precoated sand is made up of following raw material: roughing sand, binding agent, firming agent, additive and lubricant;Described roughing sand is quartz sand and what nice foundry sand mixed according to weight ratio 3:1;Described binding agent is the mixture of furane resins, carbimide and paraffin, described firming agent is the mixture of fatty amine, acetic acid and sodium silicate, described additive is the mixture of expanded graphite, carborundum and methyl silicon sodium alcoholate, and described lubricant is the mixture of silicone oil, phosphate ester and calcium stearate.Preparation method, including following step: (1) prepares binding agent;(2) firming agent is prepared;(3) additive is prepared;(5) mixing: first add in roughing sand by phosphate ester, add additive and be sufficiently mixed, adds silicone oil after mixing, add binding agent mixing, adds calcium stearate, be eventually adding firming agent, can obtain precoated sand after mixing after mix homogeneously.

Description

A kind of precoated sand and preparation method thereof
Technical field
The present invention relates to a kind of precoated sand and preparation method thereof, belong to foundary industry technical field.
Background technology
Precoated sand is covered with molding sand or the core sand of one layer of hard resin film on sand grain surface before referring to moulding.Having cold process and two kinds of coating techniques of Re Fa: resin is dissolved by cold process ethanol, and add hexamethylenamine in mulling process, make the two be coated on sand grain surface, ethanol volatilizees, and obtains precoated sand;Full-boiled process is preheating to uniform temperature sand, adds resin and makes it melt, and stirring makes resin-coating at sand grain surface, adds hexamethylenamine aqueous solution and lubricant, cools down, crushes, sieves to obtain precoated sand.For steel-casting, ironcasting.Owing to precoated sand has, intensity height, gas forming amount are low, produce casting dimension accuracy height, any surface finish, be easy to the advantages such as preservation, apply increasingly extensive in recent years.
Application number is the formula that 201210155559.2 " a kind of easily demoulding precoated sand and production technologies thereof " disclose a kind of easy demoulding precoated sand, including 100 parts of roughing sand, 1-3 part phenolic resin, the anti-mucosa liquid of 0.1-0.5 part, 0.1-0.5 part flake graphite in powder, 0.47-4.0 part hexamethylenetetramine solution and 0.08-0.25 part calcium stearate.This invention core is easy to fall off with mould, improves production efficiency, but thermostability is bad.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of precoated sand and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of precoated sand, is made up of the raw material of following parts by weight: roughing sand 100-120 part, binding agent 15-18 part, firming agent 2-4 part, additive 0.5-1.5 part and lubricant 1.5-2.5 part;Described roughing sand is quartz sand and what nice foundry sand mixed according to weight ratio 3:1;Described binding agent is the mixture of furane resins, carbimide and paraffin, described firming agent is the mixture of fatty amine, acetic acid and sodium silicate, described additive is the mixture of expanded graphite, carborundum and methyl silicon sodium alcoholate, and described lubricant is the mixture of silicone oil, phosphate ester and calcium stearate.
Described a kind of precoated sand, described binding agent is made up of furane resins 15-18 part, carbimide 4-7 part and paraffin 12-14 part in parts by weight.
Described a kind of precoated sand, described firming agent is made up of fatty amine 15-25 part, acetic acid 7-12 part and sodium silicate 8-13 part in parts by weight.
Described a kind of precoated sand, the weight sum of described acetic acid and sodium silicate and the weight ratio of fatty amine are 1:1.
Described a kind of precoated sand, described additive is made up of expanded graphite 12-18 part, carborundum 12-18 part and methyl silicon sodium alcoholate 6-9 part in parts by weight.
Described a kind of precoated sand, described lubricant is made up of silicone oil 17-23 part, phosphate ester 3-9 part and calcium stearate 3-9 part in parts by weight.
The preparation method of described a kind of precoated sand, including following step:
(1) binding agent is prepared: paraffin abundant and furane resins and carbimide under 60-63 DEG C of condition are mixed to get binding agent;
(2) firming agent is prepared: the mixing of fatty amine, sodium silicate and acetic acid can be obtained firming agent;
(3) additive is prepared: expanded graphite, carborundum and methyl silicon sodium alcoholate being sufficiently mixed uniformly, wherein expanded graphite and carborundum cross 200 mesh sieves;
(4) mixing: first add in roughing sand by phosphate ester, add additive and be sufficiently mixed, adds silicone oil after mixing, add binding agent mixing, adds calcium stearate, be eventually adding firming agent, can obtain precoated sand after mixing after mix homogeneously.
The beneficial effect that the present invention reaches:
The precoated sand preparation method of the present invention is simple, and lubricant is added separately to, and has fully ensured that the mobility of precoated sand;Each raw material mating reaction, additive improves thermostability and the wearability of precoated sand;Firming agent is the mixture of fatty amine, acetic acid and sodium silicate, and solidification effect is good, and binding agent interacts with firming agent, improves the collapsibility of precoated sand.
After testing, the precoated sand room temperature bending strength of the present invention is 6-9MPa, and burning decrement is 1.5-2.5%, and hot bending strength is 4-6MPa.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Embodiment 1
A kind of precoated sand, is made up of the raw material of following parts by weight: roughing sand 100 parts, binding agent 18 parts, 4 parts of firming agent, additive 0.5 part and lubricant 2.5 parts;Described roughing sand is quartz sand and what nice foundry sand mixed according to weight ratio 3:1;Described binding agent is the mixture of furane resins, carbimide and paraffin, described firming agent is the mixture of fatty amine, acetic acid and sodium silicate, described additive is the mixture of expanded graphite, carborundum and methyl silicon sodium alcoholate, and described lubricant is the mixture of silicone oil, phosphate ester and calcium stearate.
Described binding agent is made up of furane resins 18 parts, carbimide 4 parts and 12 parts of paraffin in parts by weight.
Described firming agent is made up of fatty amine 15 parts, acetic acid 7 parts and sodium silicate 8 parts in parts by weight.
Described additive is made up of expanded graphite 18 parts, carborundum 12 parts and methyl silicon sodium alcoholate 6 parts in parts by weight.
Described a kind of precoated sand, described lubricant is made up of silicone oil 23 parts, phosphate ester 3 parts and calcium stearate 9 parts in parts by weight.
The preparation method of described a kind of precoated sand, including following step:
(1) binding agent is prepared: paraffin abundant and furane resins and carbimide under 63 DEG C of conditions are mixed to get binding agent;
(2) firming agent is prepared: the mixing of fatty amine, sodium silicate and acetic acid can be obtained firming agent;
(3) additive is prepared: expanded graphite, carborundum and methyl silicon sodium alcoholate being sufficiently mixed uniformly, wherein expanded graphite and carborundum cross 200 mesh sieves;
(4) mixing: first add in roughing sand by phosphate ester, add additive and be sufficiently mixed, adds silicone oil after mixing, add binding agent mixing, adds calcium stearate, be eventually adding firming agent, can obtain precoated sand after mixing after mix homogeneously.
Embodiment 2
A kind of precoated sand, is made up of the raw material of following parts by weight: roughing sand 120 parts, binding agent 15 parts, 2 parts of firming agent, additive 1.5 parts and lubricant 1.5 parts;Described roughing sand is quartz sand and what nice foundry sand mixed according to weight ratio 3:1;Described binding agent is the mixture of furane resins, carbimide and paraffin, described firming agent is the mixture of fatty amine, acetic acid and sodium silicate, described additive is the mixture of expanded graphite, carborundum and methyl silicon sodium alcoholate, and described lubricant is the mixture of silicone oil, phosphate ester and calcium stearate.
Described binding agent is made up of furane resins 15 parts, carbimide 7 parts and 14 parts of paraffin in parts by weight.
Described firming agent is made up of fatty amine 25 parts, acetic acid 12 parts and sodium silicate 13 parts in parts by weight.
Described additive is made up of expanded graphite 12 parts, carborundum 18 parts and methyl silicon sodium alcoholate 9 parts in parts by weight.
Described lubricant is made up of silicone oil 17 parts, phosphate ester 9 parts and calcium stearate 3 parts in parts by weight.
The preparation method of described a kind of precoated sand, including following step:
(1) binding agent is prepared: paraffin abundant and furane resins and carbimide under 60 DEG C of conditions are mixed to get binding agent;
(2) firming agent is prepared: the mixing of fatty amine, sodium silicate and acetic acid can be obtained firming agent;
(3) additive is prepared: expanded graphite, carborundum and methyl silicon sodium alcoholate being sufficiently mixed uniformly, wherein expanded graphite and carborundum cross 200 mesh sieves;
(4) mixing: first add in roughing sand by phosphate ester, add additive and be sufficiently mixed, adds silicone oil after mixing, add binding agent mixing, adds calcium stearate, be eventually adding firming agent, can obtain precoated sand after mixing after mix homogeneously.
Embodiment 3
A kind of precoated sand, is made up of the raw material of following parts by weight: roughing sand 110 parts, binding agent 16 parts, 3 parts of firming agent, additive 1.2 parts and lubricant 1.7 parts;Described roughing sand is quartz sand and what nice foundry sand mixed according to weight ratio 3:1;Described binding agent is the mixture of furane resins, carbimide and paraffin, described firming agent is the mixture of fatty amine, acetic acid and sodium silicate, described additive is the mixture of expanded graphite, carborundum and methyl silicon sodium alcoholate, and described lubricant is the mixture of silicone oil, phosphate ester and calcium stearate.
Described binding agent is made up of furane resins 15-18 part, carbimide 4-7 part and paraffin 12-14 part in parts by weight.
Described firming agent is made up of fatty amine 20 parts, acetic acid 9 parts and sodium silicate 11 parts in parts by weight.
Described additive is made up of expanded graphite 14 parts, carborundum 14 parts and methyl silicon sodium alcoholate 7 parts in parts by weight.
Described lubricant is made up of silicone oil 21 parts, phosphate ester 6 parts and calcium stearate 6 parts in parts by weight.
The preparation method of described a kind of precoated sand, including following step:
(1) binding agent is prepared: paraffin abundant and furane resins and carbimide under 60 DEG C of conditions are mixed to get binding agent;
(2) firming agent is prepared: the mixing of fatty amine, sodium silicate and acetic acid can be obtained firming agent;
(3) additive is prepared: expanded graphite, carborundum and methyl silicon sodium alcoholate being sufficiently mixed uniformly, wherein expanded graphite and carborundum cross 200 mesh sieves;
(4) mixing: first add in roughing sand by phosphate ester, add additive and be sufficiently mixed, adds silicone oil after mixing, add binding agent mixing, adds calcium stearate, be eventually adding firming agent, can obtain precoated sand after mixing after mix homogeneously.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.

Claims (7)

1. a precoated sand, is characterized in that, is made up of the raw material of following parts by weight: roughing sand 100-120 part, binding agent 15-18 part, firming agent 2-4 part, additive 0.5-1.5 part and lubricant 1.5-2.5 part;Described roughing sand is quartz sand and what nice foundry sand mixed according to weight ratio 3:1;Described binding agent is the mixture of furane resins, carbimide and paraffin, described firming agent is the mixture of fatty amine, acetic acid and sodium silicate, described additive is the mixture of expanded graphite, carborundum and methyl silicon sodium alcoholate, and described lubricant is the mixture of silicone oil, phosphate ester and calcium stearate.
2. a kind of precoated sand according to claim 1, is characterized in that, described binding agent is made up of furane resins 15-18 part, carbimide 4-7 part and paraffin 12-14 part in parts by weight.
3. a kind of precoated sand according to claim 1, is characterized in that, described firming agent is made up of fatty amine 15-25 part, acetic acid 7-12 part and sodium silicate 8-13 part in parts by weight.
4. a kind of precoated sand according to claim 3, is characterized in that, the weight sum of described acetic acid and sodium silicate and the weight ratio of fatty amine are 1:1.
5. a kind of precoated sand according to claim 1, is characterized in that, described additive is made up of expanded graphite 12-18 part, carborundum 12-18 part and methyl silicon sodium alcoholate 6-9 part in parts by weight.
6. a kind of precoated sand according to claim 1, is characterized in that, described lubricant is made up of silicone oil 17-23 part, phosphate ester 3-9 part and calcium stearate 3-9 part in parts by weight.
7. the preparation method of a kind of precoated sand according to claim 1, is characterized in that, including following step:
(1) binding agent is prepared: paraffin abundant and furane resins and carbimide under 60-63 DEG C of condition are mixed to get binding agent;
(2) firming agent is prepared: the mixing of fatty amine, sodium silicate and acetic acid can be obtained firming agent;
(3) additive is prepared: expanded graphite, carborundum and methyl silicon sodium alcoholate being sufficiently mixed uniformly, wherein expanded graphite and carborundum cross 200 mesh sieves;
(4) mixing: first add in roughing sand by phosphate ester, add additive and be sufficiently mixed, adds silicone oil after mixing, add binding agent mixing, adds calcium stearate, be eventually adding firming agent, can obtain precoated sand after mixing after mix homogeneously.
CN201410522947.9A 2014-10-08 2014-10-08 A kind of precoated sand and preparation method thereof Active CN104325065B (en)

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CN105033163B (en) * 2015-08-07 2017-07-28 柳州市柳晶科技有限公司 Inorganic precoated sand and its manufacture method
CN105750476B (en) * 2016-04-28 2018-12-07 庆铃汽车(集团)有限公司 A kind of extraordinary precoated sand of anti-aliquation and preparation method thereof
RU2632754C1 (en) * 2016-06-10 2017-10-09 Борис Леонидович Бобрышев Moulding mixture for producing casting mould when casting magnesium alloys
CN106563764B (en) * 2016-10-26 2019-04-23 共享智能装备有限公司 A kind of 3D printing precoated sand material and preparation, forming method
CN107234209A (en) * 2017-07-26 2017-10-10 成都桐林铸造实业有限公司 A kind of precoated sand and preparation method thereof
CN107891119A (en) * 2017-11-24 2018-04-10 马鞍山松鹤信息科技有限公司 A kind of high temperature resistant 3D printing precoated sand forming and fixing agent and its preparation technology
CN108526385B (en) * 2018-04-12 2019-11-01 盐城仁创砂业科技有限公司 A kind of elimination electrostatic precoated sand and preparation method thereof
CN108607950A (en) * 2018-05-05 2018-10-02 侯马市富达造型材料有限公司 A kind of precoated sand and preparation method thereof of casting steel-casting
CN109465383A (en) * 2018-12-04 2019-03-15 合肥江淮铸造有限责任公司 A kind of engine casting dedicated core sand of cylinder body
CN109530623A (en) * 2018-12-04 2019-03-29 合肥江淮铸造有限责任公司 A kind of preparation process of the anti-vein type sand core of water jacket of high intensity
CN111889616A (en) * 2020-07-29 2020-11-06 宁夏共享化工有限公司 Curing agent for casting and application thereof

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